27991049 has 8 divisors (see below), whose sum is σ = 28665792. Its totient is φ = 27321840.

The previous prime is 27991031. The next prime is 27991057. The reversal of 27991049 is 94019972.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27991049 - 2¹² = 27986953 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 27990997 and 27991015.

It is not an unprimeable number, because it can be changed into a prime (27991099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9932 + ... + 12434.

It is an arithmetic number, because the mean of its divisors is an integer number (3583224).

Almost surely, 2^27991049 is an apocalyptic number.

It is an amenable number.

27991049 is a deficient number, since it is larger than the sum of its proper divisors (674743).

27991049 is a wasteful number, since it uses less digits than its factorization.

27991049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2767.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 27991049 is about 5290.6567645237. The cubic root of 27991049 is about 303.6265359914.

The spelling of 27991049 in words is "twenty-seven million, nine hundred ninety-one thousand, forty-nine".